Just a last report. So, I have installed my new case and the temperature difference is like day and night, dropping around 30° Celcius (from 80° to 50°, but just a small test, it will heat up a little more, but you get the idea)! Its one huge heatsink (whole case is one big heatsink) and no extra boards installed. I am just happy, plus the right emulator and no over heating issues and no fan noise! Still not really well tested, but I can see clearly the benefit.
Just someone is interested in it too, its very inexpensive also. My new case is: BIQU Aluminium Raspberry Pi Modell B for 11 Euros in Germany.